The human body, the most familiar thing in the world to every one of us, yet remains one of the most mysterious organisms. Even today, with all the medical and scientific advancements that have been responsible for in-depth knowledge about our physical bodies, many experts are still baffled by aspects of our bodies, how they work, and why.
There are now over 7 billion people living on the planet. As much as our cultures and personalities make us unique, we are all, in many way, very much the same. We've all sprung from the same single-celled organisms in the distant past and transformed into the bodies we know today. Every single part of that body has specific functions, and, beyond those functions, these bodies are capable of amazing things. Put every part of the human body together — from hair, to skin, to sneezing — and you realize the awesome natural power that is inherent in us all. If you, like the rest of the world, take the simple fact of your body for granted, we suggest you read the following list of mind blowing facts and wonder at what even the smallest parts of your body can do.
20 We Can See For 30 Miles
Our eyes will never be as powerful as an eagle's. Still, the human eye is so sensitive that, if the earth were completely flat, we could clearly see a flickering candle up to 30 miles away.
19 Our Nerve Impulses Run At 250 MpH
The sensation of pain is basically instant, when you touch something hot or prick yourself with a needle. Thanks to our highly advanced nervous system, we can react in less than milliseconds to things we should be staying away from. Nerve impulses are so fast that the electric signals responsible for sensation travel to and from the brain at an average speed of 250 miles per hour.
18 We Have an Ecosystem in our Belly Button
We can’t see them, but the human body contains trillions of tiny organisms like bacteria, millions of which live inside the belly button. Relatively speaking, there are so many bacteria living inside the human belly button alone that they could form an ecosystem the size of a rainforest.
17 A single body has more atoms than stars in the universe
All matter is made from molecules, and molecules are made from atoms. A human adult is made up of 7 octillion atoms (a 7 with 27 zeros after it). That's more than double the known stars in the universe.
16 Our Bones are as Strong as Granite
It may seem like human bones are brittle. However, bone is as strong as granite. Just one block of bone about the size of a matchbox can support more than 8 tonnes of weight.
15 We Share Our DNA with Fruit
You might have already heard that humans are only one chromosome different than chimpanzees. DNA is so precise that the slightest change can turn you into a whole new species. As it turns out, humans share 50% of their DNA with the normal, ordinary, and delicious banana.
14 Our Cells Never Stop Reproducing
Cells are the body’s building blocks. Every second, the human body produces 25 million new cells. In comparison, every 13 seconds, that is is more cells than the population of the United States.
13 We Glow in the Dark
Like deep sea creatures, humans are naturally bioluminescent, and we glow in the dark. However, the light we emit is incredible low. It is so weak, our human eyes can not actually see it.
12 Our Skin Never Stops Growing
With 25 million new cells being made every second, there comes new layers of skin. Humans lose up to 40 pounds of skin in their lifetime. The outer layer of skin is replaced every month, year after year.
11 Most of Our Cells are not Human
Out of the billions of cells that make up the human body, only about 10% is actually “human.” The other 90% is made up of various fungi and bacteria.
10 We Have More than Five Senses
Humans have five major senses. We also have more than 10 other essential senses such as balance, temperature, pain, and time. We have internal senses for suffocation, thirst, and fullness. Unfortunately, we still can't see dead people.
9 We Have 1000 Miles of Lung Capillaries
If you stretched out the 300,000,000 capillaries in your lungs end to end, the line would extend from Seattle to San Diego, or about 1300 miles.
8 Our Tears Know our Emotions
Human beings produce differently structured tears depending on the reason we’re crying. Emotions like grief, guilt, sadness, or happiness cause the molecular structure of tears to dramatically change. Like a snowflake, no tear is exactly alike at the molecular level.
7 Our Brains Can't Feel Pain
The brain can sense and process feelings of pain from other parts of the body. However, the brain itself is incapable of feeling pain. There are no pain receptors in the brain like there are in your hands, feet, or other parts of your body.
6 Our Brains are Mostly Water
The brain is less flesh and tissue than it is a liquid. The brain is made of 80% water. Actually, most of the human body itself is made from only water.
5 We are COMPLETELY covered in hair
There is no such thing as a hairless human being. Every person, including women, have as much hair on their body per square inch as a chimpanzee. The hair is so short, light, and fair that most of it is almost impossible to spot with the naked eye.
4 Our hearts are stronger than any other muscle
The human heart needs to be strong enough to pump blood throughout every vein in the body, 24 hours a day, 7 days a week. It is so powerful that it can create enough pressure to squirt blood 30 feet.
3 Our Sneezes are stronger than wind
Sneezing has a practical function. It clears the nasal cavity and throat of any congestion or blockage. The force of a sneeze is so powerful that it can exceed speeds of up to 100 miles per hour.
2 We are almost always having sex
This fact has to do more with the human population than the human body. However, it is still worth sharing. Every single day, sexual intercourse happens all over the world an average of 120 million times.
1 Our height changes every day, more than once
The human body grows in the night. Sort of. Humans are 1 centimetre taller in the morning than they are in the evening. Throughout the day, discs in the spine start to compress, and the body gets shorter.